The SRAM Force eTap AXS rear derailleur is designed for both 1x and 2x systems. It capitalizes on X-Range gearing technology for enhanced range and chain management, and features larger pulleys for improved durability and efficiency.-Orbit chain management technology keeps the drivetrain quiet and secure-SRAM AXS enabled, allowing easy personalization-Larger X-SYNC pulleys offer increased durability and efficiency-A single rear derailleur for all gearing combinations, including 1x and 2x-Battery sold separately-Compatible with 10-36 and 10-33 cassettes